Clock



May 14, 1935.

N. G. HORWITT El' AL cLocx Filed Feb. 17, 19:53

V3 f' V5 IN VENT ORS N4 rf/i/v 6501:! #www rf- Patented May 14, 1935 CLOCK Nathan George Horwitt and Morris Katcher, New

York, N. Y., assignors to Design Engineers, Incorporated, New York, N. Y.

Application February 17, 1933, serial Ne. 657,220

Y Claims.

'This invention relates to an improvement in' clocks in which the time noting figures are carried upon the periphery of rotary drums, so constructed and arranged as to expose the proper time in hours, minutes and seconds through windows on the face of a clock.

Our clock is so constructed that from the steady motion of the second drum, a step by step rotation is imparted tothe other drums, in proper related movement to indicate the time. Each drum'is used to eiiect the step by step rotation of its adjacent drum. Another feature is the provision of setting wheels projecting through the casing of the clock. l

Other objects and advantages will become apparent upon further study of the description and drawing, in which:-

Fig. 1 is a longitudinal section substantially through the center of the clock, looking to the rear. f

Fig. 2 is a cross section taken along the line 2--2 of Fig. 1.

Fig. 3 is a cross section taken along the line 3-3 of Fig. 1.

Fig. 4 is a front elevation of the clock, with the drums indicated in dotted lines, and l Fig. 5 is a development of the periphery of the drums showing the time numerals invtheir relation to indicate 11:59:55, the time shown by the clock inFig. 4.

Casing 6 of the clock has a removable floor I,A upon which are mounted standards 8. A shaft 9 is mounted in standards-8 and xed against rotation therein. Drums IIJ, II, I2, and I3 are loosely mounted on shaft 9. Drum II) is graduated to indicate seconds, minute drum II has ten numerals marked thereon toindicate the units o f the minutes' minute drum I2 has twelve numerals thereon to indicate the tens of minutes twice in the extent of its periphery and hour drum I3 has twelve numerals thereon to indicate the hours.

Drum I II has worm wheel I4 flxed to it. Meshing with worm wheel I4 is worm I5 Iixed to the top of vertical shaft I6. Electric clock motor 31 drives shaft I6. It is to be understood that a spring clock motor could be used instead; A cam I'I, fixed to shaft 8 and hence held stationary, is provided next to worm wheel I4. Pivotally mounted on second drum Il) is a lever I2, which normally tends to rotate about its pivot in Va clockwise direction, as regarded in Fig. 2, under the influence of spring 22. One end of lever Il has mounted thereon a roller I9 which contacts with the periphery oi cam I1. Pawl 2II is pivotally mounted on the other end of said lever, said pawl under the influence of a spring (not shown) in its mounting normally tending to rotate the pawl about its pivot in a counter-clockwise direcnon. on the inside of the flange or sneu er drum 5 II are ten teeth 2 I, spaced Sii-degrees, with which pawl is adapted to engage. Worm wheel I4 is constantly driven in a counter-clockwise direc-- tion, as regarded in Fig. 2, causing roller Il to treu/e1 around the high part of eem n in that 1 direction, said cam being provided with 'allow dwell 22 of suilici'ent extent 4so that when roller I9 enters the dwell, there is space enough to permit lever I8 to swing through an arc of 36 degrees of the drum II in a clockwise direction 15 under the influence of spring 23. Pawl 24 comes-'into engagement with a tooth 2I`when roller I9 enters dwell 22- causing drum I I to make a Itenth of a revolution in a clockwise direction. corresponding to the passage of a minutes time. 9 Drum I I carries a pivoted lever 24, with a pawl and roller similar to that of leverl I8 of drum Il. Cam 25 is fixed on shaft 9' adjacent drum II. It also has a dwell 26, similar to that of cam I1, except that the extent of dwell 26 is such as to 25 cause drum I2 to make one-twelfth of a revolution, every time the lower end of lever '24 passes through Iit. There are twelve teeth 21 provided on the inside of the flange of drum I2, with which the pawl of lever 24 engages, turning drum I2 one-half a revolution in a counter-clockwise direction every hour. As drum I2 has two sets of numerals I, 2', 3, 4, 5, Il or twelve in all, each partial revolution which' is in a counter-clockn wise direction, every time lever 24 engages dweil 26, will indicate the passage of ten minutes. I I only one set of numbers were provided for drum I2, lever 24 would be required to turn it one-sixth of a revolution for each impulse. Such a long throw would prove unsatisfactory with the mech- 40 anism 4as organized.

Drum I2 carries a lpivoted lever 28, with a pawl 29, a roller 30, and a spring 3| normally tending to rotate lever 28 in a clockwise direce 45 tion about its pivot. Cam 32 is fixed to shaft 9, adjacentto drum I2, and is formed with two dwells 33. There are twelve teeth 3l formed on the inside of the flange of drum I3 with which pawl 29 is adapted to engage. The extent of a I5o dwell 33 is such that when roller' 3l passes through it, lever 28 under the'inuence ci.' spring- 3|, causes pawl 29 to rotate drum I2 one-twelfth of a. revolution. As drum I2 rotates one-hal! a revolution per hour, and there are two dwells 23,

axis into operative engagement with the ute drum representing tens of minutes when said member is tripped, causing thereby a onetwelith of a revolution oi said latter minute" drum, said member rotating, when tripped, in a direction counter to that oi' the unit minute drum, another member pivotally mounted on the "minu drum representing the tens of minutes being normally spring actuated to have its outer portion swing about its pivotal axis into operative enmement withthe hour drum when said latter member is tripped, causing thereby a onetwelith of a complete revolution oi the "hour" drum, said latter member rotating, when tripped, in a direction counter to that of the tens of minutes minute" drum, and a camcorresponding to each member ilxedly mounted on said shaft, the inner portion of each member engaging its corresponding cam, the cam corresponding tothe member mounted on the unit "minute drum having a high portion and a low dweil, and the cam corresponding to the member mounted on the tens of minutes minute" drum having a high portion and two diametrically opposite low dwells. the high portion oi each cam preventing the tripping o! its corresponding member and the low dwells effecting said trippln.

8. A clock compr-Ising a fixed shaft, a row oi drums, presenting time indicating numerals. loosely mounted for rotation on said shaft, the drum at one end oi said row being motor driven, a member pivotally mounted on each drum except the one at the other end of the row from the driven one, each member being normally spring actuated to swing about its pivotal axis when tripped and to cause a partial revolution oi its i vnext succeeding drum on the shaft, means for 'restraining each member from said swing, means io'r eiiecting the tripping oi each member wherebyit swings free ot the restraining means when the drum upon which it is mounted has been givenv a predetermined amount of rotation,v and braking means adjacent each drum except the motor driven one, for preventing overrun of a drum when given a partial revolution under the impulse oi its corresponding member when 9.- Aclock as claimed in claim 8 in which the braking means comprise a wheel rotatably `mounted adjacent each drum except the driven one, each wheel having rolling engagement with ing. and in which the braking means comprise a wheel rotatably mounted adjacent each drum except the driven one. each wheel having rolling engagement with the periphery or its corresponding drum and projecting through the casing, the projecting portion of said wheels serving as means ior setting their corresponding drums by hand.

13. A clock comprising a row of rotatably lmounted drums presenting time indicating nultional resistance against its rotation to prevent overrun of a drum when given a partial rotation by its preceding drum, each wheel having a; tire of yieldable material pressed into rolling engagement with its corresponding drum.

14. A clock comprising a shaft, a row o! drums, presenting time indicating numerals loosely mounted 'for rotation on said shaft, the drum at one end o! said row being motor driven, a member pivotally mounted on each drum except the one at the other end oiA the row irom the driven one, each member being normally spring'l actuated to swing about its pivotal axis when tripped and to cause thereby a partial revolution or its next succeeding drum on the shalt, means for restraining each member from said swing, and

means ior eecting the tripping of each memberv whereby it swings free oi the restraining means when the drum upon which it is mounted has been given a predetermined amount of rotation.

15,1A clock comprising ya casing, a row or drums rotatably mounted in the casing, said drums presenting time indicating numerals. a motor for driving a drum at one end of the row, means between adjacent drums operatively connecting each drum with its neighboring drum in the row, said means eiiecting a partial rotation oi each succeeding drum to a predetermined amount o! rotation o! its predecessor in the row, beginning with the motor driven drum, a wheel. rotatably set against each drum except the motor driven one, the setting oi' each wheel providing substantial frictional resistance against its rotation to prevent overrun of a drum when given apartial rotation by its' preceding drum, each wheel having rolling engagement with its corresponding drum and projecting through the casing, the projecting portions of said wheels 12. A clock as claimed in claim 8 having a cas-.-

serving as means for setting their corresponding o drums by hand.

NATHAN GEORGE HORWITI. MORRIS KATCHER.. s 

